Comment 2 for bug 229654

I have a similar stack trace maybe related to this, happens often a network user tries to access a network device, he got the windows messages that the network share is not available, smbd crashes and after that, the user can access the network share. But from time to time, the crash continues and only a complee restart of samba has to be done.

[Thread debugging using libthread_db enabled]
[New Thread 0x7f02cd972700 (LWP 6430)]
0x00007f02cab804a5 in waitpid () from /lib/libc.so.6
#0 0x00007f02cab804a5 in waitpid () from /lib/libc.so.6
#1 0x00007f02cab21461 in ?? () from /lib/libc.so.6
#2 0x0000000000613c4b in smb_panic (why=<value optimized out>)
    at lib/util.c:1639
#3 0x0000000000618cc1 in assert_uid (ruid=4294967295, euid=1001)
    at lib/util_sec.c:102
#4 0x00000000004ba57e in become_id (uid=1001, gid=100) at smbd/sec_ctx.c:57
#5 0x00000000004ba6f6 in pop_sec_ctx () at smbd/sec_ctx.c:345
#6 0x00000000004afec9 in unbecome_root () at smbd/uid.c:400
#7 0x00000000005d36b8 in gid_to_sid (psid=0x7fffd5990990, gid=100)
    at passdb/lookup_sid.c:1202
#8 0x00000000004c432a in get_nt_acl (fsp=0xb16fb0, security_info=7,
    ppdesc=0x7fffd5990ac8) at smbd/posix_acls.c:2809
#9 0x000000000046e06e in is_visible_file (conn=0xab9240,
    dir_path=0xa85ce0 "./", name=<value optimized out>, pst=0x7fffd5991490,
    use_veto=1) at smbd/dir.c:897
#10 0x000000000046e5f0 in dptr_normal_ReadDirName (dptr=0xa13ff0,
    poffset=0x7fffd5991558, pst=0x7fffd5991490) at smbd/dir.c:562
#11 0x000000000046e664 in dptr_ReadDirName (dptr=0xa13ff0,
    poffset=0x7fffd5991558, pst=0x7fffd5991490) at smbd/dir.c:642
#12 0x00000000004a54b4 in get_lanman2_dir_entry (conn=0xab9240,
    inbuf=<value optimized out>, outbuf=0xadefb0 "",
    path_mask=0x7fffd5992770 "*", dirtype=22, info_level=260,
    requires_resume_key=4, dont_descend=0, ppdata=0x7fffd5992740,
    base_data=0xaff400 "`", end_data=0xb043ff "", space_remaining=10504,
    out_of_space=0x7fffd5992764, got_exact_match=0x7fffd599274c,
    last_entry_off=0x7fffd599276c, name_list=0x0, ea_ctx=0x0)
    at smbd/trans2.c:1149
#13 0x00000000004a8ae3 in call_trans2findfirst (conn=0xab9240,
    inbuf=0xabeb60 "", outbuf=0xadefb0 "", bufsize=131072, pparams=0xabd460,
    total_params=<value optimized out>, ppdata=0xabd470, total_data=0,
    max_data_bytes=16384) at smbd/trans2.c:1859
#14 0x00000000004a927e in handle_trans2 (conn=0xab9240, state=0xabd310,
    inbuf=0xabeb60 "", outbuf=0xadefb0 "", size=<value optimized out>,
    bufsize=131072) at smbd/trans2.c:6433
#15 0x00000000004afc3a in reply_trans2 (conn=0xab9240, inbuf=0xabeb60 "",
    outbuf=0xadefb0 "", size=90, bufsize=131072) at smbd/trans2.c:6703
#16 0x00000000004c879e in switch_message (type=50, inbuf=0xabeb60 "",
    outbuf=0xadefb0 "", size=90, bufsize=131072) at smbd/process.c:1004
#17 0x00000000004c9b92 in smbd_process () at smbd/process.c:1031
#18 0x00000000006c5f6d in main (argc=<value optimized out>,
    argv=0x7fffd59946f8) at smbd/server.c:1120

Hier the host log entry:

[2008/10/06 08:49:27, 0] lib/util_sec.c:set_effective_uid(205)
  setresuid failed with EAGAIN. uid(1001) might be over its NPROC limit
[2008/10/06 08:49:27, 0] lib/util_sec.c:assert_uid(101)
  Failed to set uid privileges to (-1,1001) now set to (0,0)
[2008/10/06 08:49:27, 0] lib/util.c:smb_panic(1633)
  PANIC (pid 6517): failed to set uid

[2008/10/06 08:49:27, 0] lib/util.c:log_stack_trace(1737)
  BACKTRACE: 20 stack frames:
   #0 /usr/sbin/smbd(log_stack_trace+0x1c) [0x613b1c]
   #1 /usr/sbin/smbd(smb_panic+0x43) [0x613c03]
   #2 /usr/sbin/smbd [0x618cc1]
   #3 /usr/sbin/smbd [0x4ba57e]
   #4 /usr/sbin/smbd(pop_sec_ctx+0x96) [0x4ba6f6]
   #5 /usr/sbin/smbd(unbecome_root+0x9) [0x4afec9]
   #6 /usr/sbin/smbd(gid_to_sid+0x168) [0x5d36b8]
   #7 /usr/sbin/smbd(get_nt_acl+0x44a) [0x4c432a]
   #8 /usr/sbin/smbd(is_visible_file+0x26e) [0x46e06e]
   #9 /usr/sbin/smbd [0x46e5f0]
   #10 /usr/sbin/smbd(dptr_ReadDirName+0x54) [0x46e664]
   #11 /usr/sbin/smbd [0x4a54b4]
   #12 /usr/sbin/smbd [0x4a8ae3]
   #13 /usr/sbin/smbd(handle_trans2+0x1be) [0x4a927e]
   #14 /usr/sbin/smbd(reply_trans2+0x6ea) [0x4afc3a]
   #15 /usr/sbin/smbd [0x4c879e]
   #16 /usr/sbin/smbd(smbd_process+0x7e2) [0x4c9b92]
   #17 /usr/sbin/smbd(main+0x8cd) [0x6c5f6d]
   #18 /lib/libc.so.6(__libc_start_main+0xf4) [0x7f22689ce1c4]
   #19 /usr/sbin/smbd [0x45a869]
[2008/10/06 08:49:27, 0] lib/fault.c:dump_core(181)
  dumping core in /var/log/samba/cores/smbd

I commented out the panic-action script to get rid of the email notifications.

root@atlantis:/etc/samba# testparm -S /etc/samba/smb.conf
Load smb config files from /etc/samba/smb.conf
Processing section "[homes]"
Processing section "[printers]"
Processing section "[public]"
Processing section "[fax]"
Processing section "[netlogon]"
Processing section "[profile]"
Processing section "[hplj1100]"
Loaded services file OK.
Invalid combination of parameters for service hplj1100. Level II oplocks can only be set if oplocks are also set.
Server role: ROLE_DOMAIN_PDC
Press enter to see a dump of your service definitions

[global]
 workgroup = NCC1701
 server string = %h server (Samba %v)
 interfaces = 127.0.0.1, 192.168.0.0/24
 bind interfaces only = Yes
 obey pam restrictions = Yes
 passwd program = /usr/bin/passwd %u
 passwd chat = *Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n .
 unix password sync = Yes
 syslog = 0
 log file = /var/log/samba/log.%m
 max log size = 1000
 time server = Yes
 logon script = netlogon.bat
 logon path = \\%N\%U\profile\%a
 logon drive = H:
 domain logons = Yes
 os level = 65
 preferred master = Yes
 domain master = Yes
 wins support = Yes
 preload = homes
 hide unreadable = Yes

[homes]
 comment = Home Directories
 read only = No
 create mask = 0700
 directory mask = 0700
 browseable = No

[printers]
 comment = All Printers
 path = /tmp
 create mask = 0700
 guest ok = Yes
 printable = Yes
 browseable = No

[public]
 path = /home/public
 write list = berni, henning
 read only = No
 directory mask = 0775

[fax]
 comment = Eingehende Faxe
 path = /var/spool/hylafax/recvq
 write list = berni, henning

[netlogon]
 comment = Domain-Anmeldedienst
 path = /home/samba/netlogon/%a
 write list = root, berni
 browseable = No

[profile]
 path = /home/%u
 read only = No
 create mask = 0700
 directory mask = 0700
 browseable = No

[hplj1100]
 comment = hplj1100
 path = /tmp
 read only = No
 create mask = 0700
 guest ok = Yes
 printable = Yes
 printer name = hplj1100
 oplocks = No
 share modes = No

root@atlantis:/etc/samba# /usr/lib/debug/usr/sbin/smbd -F
-bash: /usr/lib/debug/usr/sbin/smbd: cannot execute binary file